M wrist pin diameter?

jcarter · Jul 22, 2009

Don't have my M apart yet to measure.I see in the parts books that a 400 or 450 piston takes a 1.00" wrist pin. Is my 46 M the same size?Don't see the M wristpin diameter listed.I am looking at maybe putting the 450 kit in the M. Thanks.

TC2 · Jul 22, 2009

I know this may not help you much because it is not a definite answer, but I have an M with 450 sleeves in it. I remember measuring the wrist pin diameter when I was rebuilding it, and it seems to me that it was 1 1/16".

Dblair · Jul 22, 2009

most likely 1.312

jcarter · Jul 22, 2009

Thanks, I was thinking it was bigger.

Owen Aaland · Jul 22, 2009

You won't know for sure what size they are until you get it apart. The rods should be the larger size but it is possible that it has been overhauled before and someone used pistons with the smaller pins. There are adapter bushings to use the larger rods with the smaller pins.

jcarter · Jul 22, 2009

Would that be a bushing that was pressed into the rod to resize or did it float?

Owen Aaland · Jul 22, 2009

It is a steel bushing pressed into the rod and then there is the normal bushing inside of it that gets honed to fit the pin.

M wrist pin diameter?

jcarter

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Dblair

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Owen Aaland

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